Level 1A	The risk of acute and chronic pain is lower after endoscopic groin hernia repair compared with open surgery with or without mesh.
	The risk of sensory disturbances of the groin is lower after endoscopic groin hernia repair compared with open surgery with or without mesh.
Level 1B	There is no difference of acute and chronic pain after TEP and TAPP.
	Preoperative pain is a risk factor for chronic pain.
	The risk of acute and chronic pain after staple mesh fixation is higher compared with fibrin fixation or nonfixation (see Chapter “fixation”).
	Bilateral TAPP and TEP repairs are not associated with more acute and chronic pain compared with unilateral repair.
	The risk of acute and chronic is lower after endoscopic recurrent groin hernia repair compared with open surgery with or without mesh (see Chapter “Complicated hernia”)
Level 2A	There is no difference in chronic pain after endoscopic hernia repair with heavy or lightweight meshes (see Chapter “Mesh”).
	The use of light-weight meshes seems to reduce acute postoperative pain and discomfort compared with the use of traditional heavy-weight meshes (see Chapter “mesh”).
Level 2B	History of other pain syndromes is a risk factor for chronic pain.
	Severe acute postoperative pain is a risk factor for chronic pain.
	Endoscopic recurrent groin hernia surgery is a risk factor for chronic pain.
	Age younger than 65 years is a risk factor for acute pain.
	Age below median (40–50 years) is a risk factor for chronic pain.
	Women suffer more often from acute and chronic pain.
Level 3B	Surgical complications (seroma, hematoma, wound infection, bowel or bladder injury, and bowel obstruction) are a risk factor for chronic pain.
	Surgery-related sensory disturbance of the groin is a risk factor for chronic pain.
	Day-case surgery may be a risk factor for acute pain.
	Employment status may be a risk factor for chronic pain.